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  1. Article ; Online: Influence of volumetric energy density on the tribological behaviors of pure nickel fabricated by laser powder bed fusion

    Tianyang Yue / Zhiyi Zou / Sheng Zhang / Yidi Xu / Yong Zang

    Virtual and Physical Prototyping, Vol 18, Iss

    2023  Volume 1

    Abstract: Laser powder bed fusion (L-PBF) enables the fast fabrication of pure nickel parts with complex structures. Tribological behaviors of the printed pure nickel are crucial to its application, and highly dependent on the volumetric energy density (VED), due ... ...

    Abstract Laser powder bed fusion (L-PBF) enables the fast fabrication of pure nickel parts with complex structures. Tribological behaviors of the printed pure nickel are crucial to its application, and highly dependent on the volumetric energy density (VED), due to the variation of wear mechanisms. In this study, to investigate the wear mechanisms and evaluate the tribological behaviors of L-PBF pure nickel, samples fabricated with different VEDs were tested by a ball-on-disc tribometer under different representative loads. Unlike tribofilms formed on casting samples during sliding, L-PBF samples suffer abrasive wear, and their wear resistance decreases initially and increases afterwards with increasing VED. It suggests that the preferred VED provide good densification behaviors, high microhardness, and sufficient thin columnar subgrains, which decrease the abrasive wear. As a result, the wear resistance of the preferred L-PBF pure nickel can outperform cast counterparts under a load close to the yield strength of pure nickel.
    Keywords laser powder bed fusion ; pure nickel ; tribological behaviors ; wear mechanisms ; volumetric energy density ; Science ; Q ; Manufactures ; TS1-2301
    Subject code 620
    Language English
    Publishing date 2023-12-01T00:00:00Z
    Publisher Taylor & Francis Group
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Interdependence between energy and metals in China: evidence from a nexus perspective

    Peng, Kun / Bin Chen / Jiashuo Li / Qing Yang / Saige Wang / Shaopeng Wu / Wendong Wei / Zhiyi Zou

    Journal of cleaner production. 2019 Mar. 20, v. 214

    2019  

    Abstract: The lack of knowledge about the interdependence between energy and metals hinders sustainable management of the two essential resources. In this study, a hybrid framework which combines the Environmentally Extended Input-Output Analysis (EEIOA) and ... ...

    Abstract The lack of knowledge about the interdependence between energy and metals hinders sustainable management of the two essential resources. In this study, a hybrid framework which combines the Environmentally Extended Input-Output Analysis (EEIOA) and Ecological Network Analysis (ENA) was constructed to evaluate energy-metals use and flows within China's economic system in 2012, from the perspective of nexus. Furthermore, the structural properties of nexus networks and mutual relationships between sectors were simultaneously explored. The results show that hybrid energy (direct energy + metals-related energy) and hybrid metals (direct metals + energy-related metals) used by all the sectors were 1.22 and 1.05 times their direct energy and direct metals use, respectively. In both hybrid energy and metal networks, mining industry and construction industry had a strong control and dependence relationship (over 50%) with other sectors, reflecting the tight inter-sectoral connection between energy use and metals use. Therefore, stabilizing these main control and dependence pathways is essential to the system's effective operation. In addition, alleviating excess industrial capacity and optimizing economic structure are two effective measures to improve the currently low energy-metals circulation efficiency within China's economy system. By revealing the nexus between energy and metals in China, this study provides important policy implications for trade-offs and synergies between energy and metals use.
    Keywords construction industry ; economic structure ; economic systems ; energy ; input output analysis ; issues and policy ; metals ; mining ; trophic relationships ; China
    Language English
    Dates of publication 2019-0320
    Size p. 345-355.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0959-6526
    DOI 10.1016/j.jclepro.2018.12.253
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Carbon emissions of urban power grid in Jing-Jin-Ji region: Characteristics and influential factors

    Wei, Wendong / He Zhu / J.S. Li / Ji Li / Sili Zhou / Xibo Wang / Zhiyi Zou

    Journal of cleaner production. 2017 Dec. 01, v. 168

    2017  

    Abstract: Rapid urbanization drives the expansion of urban power girds, which involves enormous energy intensive products such as steel and concrete and inevitably results in a great quantity of carbon emissions. However, little has been done to investigate urban ... ...

    Abstract Rapid urbanization drives the expansion of urban power girds, which involves enormous energy intensive products such as steel and concrete and inevitably results in a great quantity of carbon emissions. However, little has been done to investigate urban power girds' impact on carbon emissions. To solve this problem, this study makes efforts to calculate the carbon emissions of urban power grid in Jing-Jin-Ji region, one of the most populous and economically dynamic regions in China, in light of the hybrid method. Moreover, the depreciation life of urban power grids is taken into consideration for the first time, which avoids the underestimation of the accumulated carbon emissions of urban power grid due to depreciation. The results show that the accumulated carbon emissions of urban power grid in Jing-Jin-Ji region are 2.71E+06 t CO2 eq. in 1993. When it comes to 2014, this figure increases by over 7.2 times. The majority of the carbon emissions by typical urban substations and transmission line projects are contributed by electrical equipment, steel and construction industries. 4 scenarios are set to predict the future carbon emissions by power grids in Jing-Jin-Ji region. The highest accumulated carbon emissions in 2020 are projected to be 7.63E+07 t CO2 eq. under the condition shortest depreciation life (SDL) in the First Year Finished (FYF) scenario. Regression analysis is also carried out to show some influential factors such GDP's influence on power grids' carbon emissions, suggesting that the correlation between carbon emissions and regional economic development becomes more significant after Power System Reform Plan in 2002. This study not only draws a holistic picture of power grid but also bears significance to policies and actions in urban regions.
    Keywords carbon ; carbon dioxide ; concrete ; electrical equipment ; emissions ; energy ; issues and policy ; regression analysis ; steel ; urban areas ; urbanization ; China
    Language English
    Dates of publication 2017-1201
    Size p. 428-440.
    Publishing place Elsevier Ltd
    Document type Article
    ISSN 0959-6526
    DOI 10.1016/j.jclepro.2017.09.015
    Database NAL-Catalogue (AGRICOLA)

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